Quantum cryptography will likely play a key role in the future of secure communications. An effective Quantum Key Distribution (QKD) system is the central requirement for a successful quantum cryptographic system. Current QKD systems use a limited and incomplete set of standards to define the interfaces between the quantum system components and the necessary digital components and networks. This document proposes to develop Interface Definition Documents (IDDs) and eventually software tools utilizing those interface standards to control the physical interfaces and management and analysis software of QKD systems. IDDs will be developed for multiple interface layers including: physical interface, management interface and analysis interfaces. As a unique feature of this approach, two analysis components are considered: blue analysis interface, addressing countermeasure factors that can be monitored internally, and a red (threat-side) analysis interface, addressing vulnerability factors that can be monitored externally. Through consulting and teaming arrangements, it is planned to work closely with two organizations developing prototype QKD systems and standards, BBN and NIST.